set meetup size target to 15 (#358) #758

Job	Run time
Build Runtimes (encointer-node-notee)	3m 27s
build	4m 24s
build-try-runtime-and-benchmarks	5m 48s
unit-tests	2m 21s
Cancel Previous Runs	3s
cargo-toml-fmt	11s
Rust check +nightly fmt --all -- --check (x86_64-unknown-linux-gnu)	26s
Rust check clippy -p encointer-client-notee (x86_64-unknown-linux-gnu)	5m 42s
test_bootstrap_demo_community.sh	18m 48s
test_bot_community.sh	7m 51s
test_register_business.sh	2m 0s
Draft Release	0s
Publish Runtimes	0s
	51m 1s

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